rar is a command line utitility for creating RAR archives.

This SlackBuild repackages the official binary.  

This is a shareware program. If you would like to continue using RAR 
after 40 days, you will have to purchase a license. See license.txt in 
the docs directory for more details.

To include unrar in the package, run the script like this:
UNRAR=yes ./rar.SlackBuild